新型离心泵射流式自吸装置及试验

离心泵自吸装置具有较广泛的用途。研究了一种自吸快、对泵外特性影响小的新型射流式自吸装置。该自吸装置能够与普通离心泵直接、快速、方便地组成一体。它的工作原理是在普通自吸罐的基础上集成一套循环射流系统,用来加快离心泵自吸过程中进口气液混合速度和出口气液分离速度,以达到快速排除离心泵吸入段空气的目的。对自吸装置分别做了自吸时间等性能试验。试验结果表明,射流式自吸装置可以显著地缩短自吸时间,自吸时间最短仅为11 s;装置与离心泵连接后对泵的外特性影响较小,在设计点时泵效率仅降低1.83%。

Experimental study on a new self-priming equipment of centrifugal pumps

In order to realize the self-priming for normal centrifugal pumps, a new self-priming equipment with simple structure was designed, which can be maintained conveniently and combined to centrifugal pump as a whole. The design of this equipment was based on the technique of self-priming tanks. A jetting-recycle system was added to the self-priming tank. When the pump starts, the equipment begins to work, which increases the speed of mixing gas and liquid in the pump inlet, as well as the separating speed in the pump outlet. So the self-priming time decreases significantly. The experimental results indicate that the new equipment can decrease the self-priming time evidently, the minimum self-priming time is just 11 s, and the performance curve is steady and smooth. The external characteristic of centrifugal pump is not influenced, the pump efficiency is decreased by 1.83% at design point. So the equipment can meet engineering needs.